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Jan. 29 1924. 1,482,079

J. F. LAMB CUT-OUT DEVICE FOR ELECTRICAL UTENSILS Filed June 4, 1919 ATTORNE Y.

A ,ef-Wig. ingenui:

Patented Jan. 29, 1924.

UNITED vs'irliTlz-s IPA TENTv OFFICE.

JosEIfH r. LAMB, oF NEWnR'IrAlN, CONNECTICUT, A ssrGNor. 'ro LANDERS,FRARY e CLARK, oF NEW BnITArN, CDNNECTICUT, A CQRBQRATION 0FCONNEQTICUT.

CUT-QU'IJDEVICE Fon. ELECTRICAL UTENSILS.

Application -led June 4,

To all w/zom it may concern:

Be it known that 'I JOSEPH F. 'LAL/m, a citizen of the UnitedStates;and-a lresident of'New B ritain, in the county of Hartford,

State of Connecticut, have inventedpertainA 'oftheatgthe obie'ot'- beinglto provide adevice of this sort i havingfeatures novelty 'and colator,but itis to be understood 'tlt my :invention is vap'l'jli'ezible'f-frseg'enerally on terminal'wires` 12'isinterposed fs! pair' of 1319.Serial No. 301.724.

18 onl the plate 15 and having at its free end a circuit closing member19 adapted to vbridge the gap between the spring blades 14 whenv thedevice is in operative position. The fixed end of the spring 17 is bypref erence seated in a groove in the lug 18 with 'the edges of thespring engaging the side walls of the groove for aiding inmaintainingjthe spring against lateral movement.

'Tl'ie outer -end of the spring may be of a '-'redued-Wicith to obtainthe required fiexihility-"zinti the Circl1it`closing' member 19rnay`con's1stof a U-shaped member insulated fiblyfoinedofitivo strips ofmetal, one of vt-he'stripsQB'being j ieee offsteel hardened andtempered' throng out its entire length 'end 'this- -strip'is secured tothe other strip 24ivhich maybeof brasi'sb'y moans of rivets 2 5; ne "o`f the strips, in 'the present instance 'the's'teelone 23, hns 'vgreater degtee of spring'action thnn the other strip andfthis strip '23vbeing hardened and "tempered thebar will not deteriorate upon 'a rise'ofteniperature nor: is there any danger of 'itsstting lliter it isoperzited a number When the bars be'ome heated, they are ie'xed duetothe different ,coeliicientsof expension of the strips and etei-they' are:cooled-they gain nssme their normal the, 'sllnrin'ginaterial :thespring aetion'; thereqfivillnid in bringing' the 'ber lbeek tonormlposition more redly'nnd quickly.

s teel'strip liof'efzichbar'has an in- "tegrnl'liig 26'wh'ieh i s indlir1 ed to the plane `of the bnr soes to providen'inclined surfavamst thespring iiid this .portio'nihesjits 5 @ge-*entete fe ange-@13o betweenment 31, show n in thus providing aisensitivetand-fdelicate dis--engaging action ofthe parts. Y

, temperature of which thev spring is positioned so as (opre-\ent"orelative rotary movement between the piece 28 and the spring.

The pie 28 has a portion extending at right angles to the spring and,when two therinoslatic bars are employed, the edges .57 at oppositesides of the spring are oppositely inclined as most clearly shown inFig. 4. The lower end of the piece 28 is in the form of a wedge which,when the spring is forced into operative position, ,will cause thethermostatic bars to spread apart and allow the'piece 28 to move beneaththe lugs 26. It

4 will be seen from Figs. 4 and 5 that the con- 16 tacting surfaces onthe lugs 26 and member 28 arefinclined atan angle'to the direction ofmovement ofthe springand this arrangementiis of advantage in thatprovides a camaction, the force ofthe spring-to move out of engagementwith the thermostatic bar being utilized ,to aid` in the' disengagementof theparts.)y 4After .the thermostatic 'bars havegmoyed -a slight,distanceuponajrise -in temperature,Y the bar ,fvvill` thereafter f bemoved4 4mechanicallydue-to the pressure of ,the spring and thearrangement of rthe oppoanother, .permitting of a n icety of adjustmentand assuring that the springfwill be released when the temperature.'ofthe utensil to which the circuitbreaker is attached reaches. a4predetermined ffpoint.' The .-1ugi26 being hardened, wear., between theHinter- ,.It is an object of the present invention .to prevent`premature. release of .the circuit closer due to jarring or joltin aswhen Vthe utensil .to which it is attache is set down, andto accomplishthis objectiI have pro- .vided on one side of the circuit closerthermostatic means which may comprise the bar above described, and onthe other side means engaginv the circuit closer for steadying the same.51 preference, this steadying means comprises a second thermostatic baras shown in Figures 1 to 4 inclusive. Each of thevthermostatic devicesaids in preventing the spring 17 from moving laterali out of engagementwith the other bar an should one of the bars,.due to any cause, beaccidentally moved out of engagement withthe circuit closer, ,the otherbar will maintain the .spring in o erative position until the e utensilreaches a predetermined degree. If desired, however, the

steadying means my comprise a fixed abutig.l 5.,

vIt is of course obvious that my invention .is susceptible ofvariousmodications and changes which are within the. spirit ofthe`invention without departingfrom the scope of the following claims, iting understood that the present disclosure of my invention is by way ofillustration only and it is not to be taken as restrictive of myconception.

I claim as my invention:

l. A thermal circuit breaker having a spring secured at one end andprovided at one side near its free end with an inclined surface, -anelectrically conductive circuit closing member carried by andelectrically insulated from the free end of said spring, and athermostaticbar extending longitudinally of and movable in a plane atright angles to the path of movement of said spring, the said thermallycontrolled bar having a part with a surface linclined similarlyr to and4slidable on said inclined surface of the spring supporting the ssame,thermostatic means ateach sideofsaid-spring, and c0- foperatingsimilarly ,inclined jparts between each of said means and thespring,-the 'surfaces on the oppositeidesoffsaid spring beingoppositelyiinclined',- sitely inclined surfaces whichshdeup'onone I andada ted to bridge `the gap between said contact lades, a thermostaticbar secured at lone endito the side of said lug, and 1nter engagingparts between the free end of said -bar and said. spring.

5.- A crcult breaker having `a spring secured at one end, a circuitclosing member on the. free end 'of said spring, @thermostatic bar, amember on the spring comprising aiplate bent atright angles to form aportion resting against the spring and a second portion Aextending atright angles thereto and having a surfacezwth which said bar. engages,and a button securing said lastmentioned member to said spring.

-6. A :circuit breaker havin ,a spring secured at o ne end, a circuit cosng member o n the free end of said spring, av thermostatic'bar amember having' adportion lying .-v against the spring and .provi l edwith side flanges engaging the edgesoi ythe spring, said member alsohaving a second portion at right angles .to the spring4 and provided llOwith a surface with which said bar engages, ,150

and means for securing said member to the spring.

7. A thermal circuit breaker for interrupting the circuit in anelectrically heated utensil when said utensil becomes overlieated andcomprising a plate removably secured t said utensil, contact blades, a,circuit closing member adapted to bridge the gap therebetween, and a,pair of thermally controlled members one on each side of Said circuitclosing member and cooperating therewith, said contact blades, circuitclosing member and said thermally controlled members being secured infixed relative positiorr on said plate to permit adjustment of thecircuit breaker prior to the attachment of the plate to the utensil.

8. A circuit breaker comprising a plate, contact blades, a lug on. saidplate, a spring secured to the outer face of said lug, a circuit closingmember carried by said spring and adapted to bridge the gap between saidcontact blades, a thermostatic bar secured to each side of said lug, andcooperating parts between said bars and spring for maintaining saidspring in operative position.

9. A circuit breaker including a projection, a spring secured to theouter face of said projection, circuit closing means carried by saidspring, a fiat tlierinostatic bar secured to each side of said lugwhereby the planes in which said spring and bars lie are substantiallyat right angles to each other, and cooperating parts between said barsand spring [or maintaining the latter in operative position.

JOSEPH F. LAMB.

